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Mortality rates, life tables and life expectancy under a stationary population composition

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  • Muszynska-Spielauer, Magdalena
  • Riffe, Tim

Abstract

While the effect of unobserved heterogeneity on aggregate mortality patterns is well studied, an analogous effect of composition by observed characteristics is often ignored. In this research note, we propose a set of simple and general formulas to adjust period mortality rates and life tables to suppress heterogeneity imposed by the non-stationary composition of cohorts according to observed population characteristics. We also offer an approach to decompose differences in period life expectancy under a stationary composition into compositional differences and the disparity of life expectancy (LE) of the sub-groups. We illustrate this lagged compositional effect on the example of educational attainment in Denmark in 1991-1995 and 2011-2015, and discuss the effect of educational expansion on developments and sex-gap in LE. We demonstrate that the difference between LE and LE under a stationary educational composition (LEsec) in Denmark is non-ignorable: the gap accounts for up to 1.9 years in 2011-2015. The educational expansion in the study years contributed to the increase in LEsec, of which women benefited to a greater extent. Taking into account population stationary composition by observed population characteristics in total mortality rates improves our understanding of mortality at current conditions.

Suggested Citation

  • Muszynska-Spielauer, Magdalena & Riffe, Tim, 2022. "Mortality rates, life tables and life expectancy under a stationary population composition," OSF Preprints rnbf4_v1, Center for Open Science.
    • Handle: RePEc:osf:osfxxx:rnbf4_v1
    DOI: 10.31219/osf.io/rnbf4_v1
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